Are these Brake calipers normal?

Are these Brake calipers normal?

Author
Discussion

Bobton125

Original Poster:

253 posts

68 months

Monday 20th May 2019
quotequote all
Gen 2 987 Cayman 2.9

I took all the calipers off today.

I noticed only on both front calipers there is a thin metal plate screwed into the piston on each pair of pistons.

I've never seen Porsche Brakes before, is this normal? If not, any idea why somebody would have done this and should i keep them like that? They worked perfectly fine before taking them off.

(i'm trying to upload pictures but it says to try again later)

gsewell

693 posts

282 months

Monday 20th May 2019
quotequote all
Are you looking at the anti vibration dampers
https://www.design911.co.uk/mobile/#part;id=3822

Bobton125

Original Poster:

253 posts

68 months

Monday 20th May 2019
quotequote all
Yes they look exactly like that shape on those in the link

So they came out the factory with those on then i presume?

Never seen these before on calipers, glad they weren't a bodge a previous owner has done

gsewell

693 posts

282 months

Monday 20th May 2019
quotequote all
I've not done my own brakes on my Cayman, but I believe that they are similar in function to anti squeal shims with an adhesive strip to hold the pads in place against the pistons. They are normally replaced as part of the pad swap.

Bobton125

Original Poster:

253 posts

68 months

Monday 20th May 2019
quotequote all
Am i able to re use them? If so, do i need to put a grease / adhesive on the back of them?

Slippydiff

14,742 posts

222 months

Monday 20th May 2019
quotequote all
Host your images here : https://imgur.com/

Press the New Post tab. Hit the browse tab. Find the image you wish to upload and press the open tab.
The image will take a couple of seconds to upload. When it's completed, hover your cursor over the image and in the top right hand corner it will bring up a small downward facing arrow. Hover the the cursor over this and it will bring up a Get share links tab. Click on this and then copy the BBCode (forums) link and paste it into your post on here.

We can then establish if what you have is the original factory anti-squeal shims or some aftermarket stainless or titanium shims to reduce heat transfer from the pad backplates to the caliper pistons and thereon to the brake fluid.


Bobton125

Original Poster:

253 posts

68 months

Monday 20th May 2019
quotequote all
Thanks Slippydiff..

For when i refit with the old pads, what would be the best option with these? Put the pads back in how they were? Put Copper grease on the back of the pad?







Edited by Bobton125 on Monday 20th May 23:27


Edited by Bobton125 on Monday 20th May 23:29

brownspeed

730 posts

130 months

Tuesday 21st May 2019
quotequote all
Mine were stuck to the back face of the pads; you can prise them out of the caliper pistons quite easily

Slippydiff

14,742 posts

222 months

Tuesday 21st May 2019
quotequote all
Those are the original anti-squeal shims.
If you’re using the car for a lot of track work, leave them out altogether or buy a set of stainless steel or titanium shims. There are several suppliers for them (Design 911 in the UK stock them)

If the car is used primarily for road use, remove the old shims and fit a new replacement set.
It’s ages since I fitted a set, but IIRC the lugs on the back of the shims either just slide into the open end of the caliper pistons (ensure the pistons are fully retracted back into the caliper if you’re fitting new pads, otherwise you won’t get the shims in) or they clip in, having slid/clipped the shims into the end of the pistons, you then tear of the adhesive backing material on the front of the shims to expose the adhesive that sticks the front of the shim to the back of the brake pad.

Edit to add, the screw heads you can see on the front of the anti-squeal shims, secure the lugs to the shims, they don’t fasten the shims to the pistons smile

Edited by Slippydiff on Tuesday 21st May 07:30

Bobton125

Original Poster:

253 posts

68 months

Tuesday 21st May 2019
quotequote all
Slippydiff said:
Those are the original anti-squeal shims.
If you’re using the car for a lot of track work, leave them out altogether or buy a set of stainless steel or titanium shims. There are several suppliers for them (Design 911 in the UK stock them)

If the car is used primarily for road use, remove the old shims and fit a new replacement set.
It’s ages since I fitted a set, but IIRC the lugs on the back of the shims either just slide into the open end of the caliper pistons (ensure the pistons are fully retracted back into the caliper if you’re fitting new pads, otherwise you won’t get the shims in) or they clip in, having slid/clipped the shims into the end of the pistons, you then tear of the adhesive backing material on the front of the shims to expose the adhesive that sticks the front of the shim to the back of the brake pad.

Edit to add, the screw heads you can see on the front of the anti-squeal shims, secure the lugs to the shims, they don’t fasten the shims to the pistons smile

Edited by Slippydiff on Tuesday 21st May 07:30
Thanks for this. It is for road use only.

I have bought some replacement ones to stick on for when i put the pads back in.

I'm used to putting copper grease on the back of pads before fitting them, is this needed on the fronts shims or the backs at all? The rear does not have these shims

gsewell

693 posts

282 months

Tuesday 21st May 2019
quotequote all
The back of the pads need to be grease free or the adhesive strip won't hold.

Slippydiff

14,742 posts

222 months

Tuesday 21st May 2019
quotequote all
gsewell said:
The back of the pads need to be grease free or the adhesive strip won't hold.
This ^ As the the anti-squeal shims do a far better job of damping resonance than any amount of Copaslip smile

Bobton125

Original Poster:

253 posts

68 months

Wednesday 22nd May 2019
quotequote all
ok, should i grease the lugs that go into the pistons?

Also, should i grease the back of the pads for rear calipers? these have no shims

Edited by Bobton125 on Wednesday 22 May 10:11

Porsche911R

21,146 posts

264 months

Wednesday 22nd May 2019
quotequote all
Bobton125 said:
ok, should i grease the ugs that go into the pistons?

Also, should i grease the back of the pads for rear calipers? these have no shims
I only grease the spring backing plates contact area's and the rod holding that on.

Bobton125

Original Poster:

253 posts

68 months

Wednesday 22nd May 2019
quotequote all
ok great, what grease do you use?

Slippydiff

14,742 posts

222 months

Wednesday 22nd May 2019
quotequote all
Bobton125 said:
ok, should i grease the lugs that go into the pistons?

Also, should i grease the back of the pads for rear calipers? these have no shims

Edited by Bobton125 on Wednesday 22 May 10:11
No need to grease the lugs on the back of the pads, they're not that tight a fit in the recess in the pistons (I suspect they act as a mass damper once they're stuck to the back of the pad too)

Rear pads/calipers should have these "stickies" which clip into the pistons and stick to the back of the pads :

https://www.design911.co.uk/fu/prod3824/Anti-Vibra...

When you see the price, you'll understand why they've been left out ...

Slippydiff

14,742 posts

222 months

Wednesday 22nd May 2019
quotequote all
Bobton125 said:
ok great, what grease do you use?
https://eshop.wurth.co.uk/Product-categories/Alu-paste-AL-1100/31083008080401.cyid/3108.cgid/en/GB/GBP/

Though I wouldn’t bother as it’s really not required in all honesty.